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		<a class="header-logo header-affix-hide margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[Usaco2006 Dec]Cow Roller Coaster</a>
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                [Usaco2006 Dec]Cow Roller Coaster                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">The cows are building a roller coaster! They want your help to design as fun a roller coaster as possible, while keeping to the budget. The roller coaster will be built on a long linear stretch of land of length L (1 &lt;= L &lt;= 1,000). The roller coaster comprises a collection of some of the N (1 &lt;= N &lt;= 10,000) different interchangable components. Each component i has a fixed length Wi (1 &lt;= Wi &lt;= L). Due to varying terrain, each component i can be only built starting at location Xi (0 &lt;= Xi &lt;= L-Wi). The cows want to string together various roller coaster components starting at 0 and ending at L so that the end of each component (except the last) is the start of the next component. Each component i has a &quot;fun rating&quot; Fi (1 &lt;= Fi &lt;= 1,000,000) and a cost Ci (1 &lt;= Ci &lt;= 1000). The total fun of the roller coster is the sum of the fun from each component used; the total cost is likewise the sum of the costs of each component used. The cows' total budget is B (1 &lt;= B &lt;= 1000). Help the cows determine the most fun roller coaster that they can build with their budget. </span></p>
<div><span style="font-size: medium">奶牛们正打算造一条过山车轨道．她们希望你帮忙，找出最有趣，但又符合预算的方案．&nbsp;&nbsp;过山车的轨道由若干钢轨首尾相连，由x=0处一直延伸到X=L(1&le;L&le;1000)处．现有N(1&le;N&le;10000)根钢轨，每根钢轨的起点Xi(0&le;Xi&le;L-&nbsp;Wi)，长度wi(l&le;Wi&le;L)，有趣指数Fi(1&le;Fi&le;1000000)，成本Ci(l&le;Ci&le;1000)均己知．请确定一种最优方案，使得选用的钢轨的有趣指数之和最大，同时成本之和不超过B(1&le;B&le;1000)．</span></div></p><hr/><h3>输入格式</h3><p><p><span style="font-size: medium">* Line 1: Three space-separated integers: L, N and B.</span></p>
<p><span style="font-size: medium">&nbsp;* Lines 2..N+1: Line i+1 contains four space-separated integers, respectively: Xi, Wi, Fi, and Ci.</span></p>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;第1行输入L，N，B，接下来N行，每行四个整数Xi，wi，Fi，Ci．</span></div></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">* Line 1: A single integer that is the maximum fun value that a roller-coaster can have while staying within the budget and meeting all the other constraints. If it is not possible to build a roller-coaster within budget, output -1. </span></p>
<p></p></p><hr/><h3>样例输入</h3><pre>5 6 10
0 2 20 6
2 3 5 6
0 1 2 1
1 1 1 3
1 2 5 4
3 2 10 2


</pre><hr/><h3>样例输出</h3><pre>17
 选用第3条，第5条和第6条钢轨</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Silver</p>
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